Why not just specify "T-65 only"? Solves the problem.
Because, technically, there is no T-65 in this game. Only the X-wing and T-70 X-wing. And the convention for naming of ships is there to cover that the TIE Adv. Prototype is not the same as the TIE Advanced and TIE Advanced X1. So, you can thank that little bit of flavor on Vader for that.
